Umbrella



FIG. 1 is a perspective view embodying the inventive umbrella design;

FIG. 2 is a right side view thereof, with the left side being a mirror image thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines in the figures depict portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for an umbrella, as shown and described. 